Potential-regulator.



H. W. CHENEY.

POTENTIAL REGULATOR.

APPLICATION FILED APR.22, I910.

1,153,422. Patented Sept. 14, 1915.

UNITED STATES PATENT OFFICE.

HERBERT'W. CHENEY, OF MILWAUKEE, WISCONSIN, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO ALLIS-OHALMERS MANUFACTURING COMPANY, A CORPORATION OF DELAWARE.

Specification of Letters Patent.

POTENTIAL-REGULATOR.

Application filed April 22, 1910. Serial N 0. 557,026.

Toall whom it may concern Be it known that I, HERBERT \V. CHENEY, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of \Visconsin, have invented certain new and useful Improvements in Potential- Regulators, of which the following is a full, clear, and exact specification.

My invention relates to potential regulators.

It is the object of my invention to provide a simple and efficient arrangement for varying the ratio of transformation of a transformer. To attain this object, part of a winding of the transformer is provided with taps and by certain controlling means this part of the winding may be connected, either inpart or in whole, so as either to assist or oppose the remainder of the winding. The controlling mechanism consists of a movable member which connects successively with the several taps, then reverses the connection of one part of the winding with respect to the other, and then again engages successively with the several taps in the same order as before. By this means the part of the winding provided with taps is first made to oppose the remainder of the winding and is gradually cut out, and is then made to assist the remainder of the Winding and is gradually cut in. p

The various novel features of my invention will appear from the description and drawing and will be particularly pointed out in the claims;

The single figure of the drawing shows diagrammatically one embodiment of my invention.

For the sake of simplicity the drawing shows the invention as applied to a singlephase transformer, though this is merely illustrative. In polyphase transformers the additional parts are in general merely duplicates of the arrangement illustrated, and

are preferably operated simultaneously therewith.

The transformer whose ratio of transformation is to be controlled is provided with a primary winding 20, a main secondary winding 21, and an auxiliary secondary winding 22. These two secondary windings may be considered as parts of the whole secondary winding. The secondary winding 21 is connected at one end to the main 23 of the circuit 2324, and at the other end to a contact finger 25 of a drum controller. The secondary winding 22 is provided with taps which are connected respectively to contact fingers 26 to 31 inclusive of the same drum controller. The main 24 of the supply circult is connected directly to the finger 32 of this same controller and through a preventive resistance 34 to another finger 33 thereof. The fingers 25 to 33 inclusive cooperate with the rotatable drum 35, which is shown in development and may be operated in any usual manner. The finger 25 constantly engages the ring 36 on such drum. The fingers 26 to 31 inclusive at times engage the contact segments 37 to 42 respectively and the contact fingers 32 and 33 each cooperate successively with sets of contacts 43 and 44 respectively. The various contact fingers are interconnected as indicated, there being one of each of the latter set of contacts for each of the segments 36 to 42 inclusive. tion, but may be moved through nearly two revolutions or between the positions 1 and 13. It is prevented from moving beyond these positions by any desired means, as by means of a pin 45 mounted on a lever 46 The controller'has no ofl posiand'sliding in a groove 47 on the controller drum. The end taps from the secondary winding 22, besides being connected to the contact fingers 26 and 31, are also connected respectively to contact fingers 48 and 49 cooperating with the ring 36. The two fingers 48 and 49 are so arranged that only one of them engages the ring 36 at any one time, for when either finger engages such ring it connects its end of the winding 22 to the right hand end of the winding 21. This may be accomplished by mounting the two contacts on the same arm, which is arranged to be operated by a pin 50, fork 51, and spring 52 to bring one or the other of the fingers in contact with the ring 36 as the controller passes through position 7.

With the controller in the position shown, the voltage applied to the circuit 2324 is at its lowest, for all five sections of the secondary winding 22 oppose the secondary winding 21. The secondary circuit extends from the lead 23 through the secondary winding 21, finger 25, ring 36, finger 48, the five sections of the secondary winding 22, finger 31, segment 42, the proper segment 43, and finger 32 to the other lead 24. As the controller is moved forward, from position 1 to position 2, the finger 30 engages the segment 41, and the finger 33 the proper segment 44, thus connecting through the preventive resistance 34 the secondary taps connected to the fingers 30 and 31; then the contact-fingers 31 and 32 pass out of engagement with the contact segments with which they were in engagement, leaving four sections of the secondary winding 22 connected in opposition to the secondary 21, the connection to the main 24 being through the preventive resistance 34; then the contact finger 32'engages the next segment 43, thus short-circuiting the'preventive resistance 34; and finally, as the controller approaches position 2, the contact finger 33 leaves the segment 44 with which it was in engagement. Thus in position 2 four sections of the secondary winding 22 oppose secondary 21, and the voltage is one step higher than in position 1. As the controller is moved farther forward to position 6 the voltage is raised step by step by cutting out these four sections of the secondary winding 22 by repetitions of the same process, so that in position 6 the secondary circuit includes no part of the secondary winding 22. \Vhen the controller is now moved forward from engagement and the finger 49 into engagement with the ring 36. At this time neither of these two fingers carries current. Asthe controller is now moved forward to position 8, which is the same as position 1 except for the fingers 48 and 49 and the parts associated therewith, the secondary circuit is changed so that between the ring 36 and the finger 32 are included the fingers 49 and 31.

and the segment 42; however, this produces no change in voltage, for none of 'the sections of the secondary winding 22 are cut into circuit. As the controller is now moved forward from position 8 to position 13, which correspond to positions 1 to 6, the sections of the secondary winding 22 are cut into circuit in the same order as they were previously out out of circuit, but because the finger 49 instead of the finger 48 now engages the ring 36 these sections of the-secondary 22 now assist'the secondary 21 andance 34 is connected in circuit so that the secondary circuit is not broken and none of the sections of the secondary winding 22 are short-circuited.

When the controller is moved backward from position 13 the voltage is lowered by a series of operations the reverse of those above described, the secondary winding 22 first assisting the secondary winding 21 and being gradually cut out, the connections of the lower end of the secondary winding 21 being then transferred from the upper to the lower end of the secondary winding 22, and the secondary winding 22 being then'gradually cut into circuit and'opposing the secondary winding 21. The movement of the controller may be stopped at any position. The positions may be indicated in any desired manner, as for instance by notches 53 on the side of the groove 47 toward which notches the pin 45 is biased as by means of the spring 54. 4

Various modifications may be made in the precise arrangement shown and described, and all such which do not depart from the spirit and scope of my invention I aim to cover in the following claims.

What I claim as new-is: I

1. In combination, a transformer having a winding-divided into two parts, taps from one of such parts, means including the same contacts for twice automatically making a connection to said taps successively in the same order, and means for reversing the connections of one of the parts of said windingto the other at the completion of the first set of connections to said taps.

. 2. In combination, a transformer having a divided winding, taps from said winding, means comprising a controller having contacts twice operative for making a connection to saidtaps successively in the same order, and'means for reversing the terminal connections of said divided winding at the completion of the first set of connections to Said taps.

3. In combination, a winding having an intermediate tap, a controller having a con- .tact connectible to said tap twice during movement of said controller in the same direction, and means operative to reverse a terminal connection of said winding subsequent to the first connection of said contact to said tap and prior to the second connection thereof.

In testimony whereof I afiix my signature, in the presence of two witnesses.

HERBERT W. CHENEY.

' Witnesses:

CHAS. L. BYRON, GEo. B. SCHLEY. 

